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s = 20 cm
ljarak bayangan
s' = (s x f) / (s - f)
s' = (20 x 4) / (20 - 4)
s' = 80 / 16
s' = 5 cm
perbesaran bayangan
M = | -s'/s |
M = | -5/20 |
M = | -0,25 |
M = 0,25 kali
jadi perbesaran bayangan 0,25 kali (diperkecil)